TraceContext.Write 方法

定義

命名空間:: System.Web

組件:: System.Web.dll

重要

部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。

將追蹤資訊寫入追蹤日誌。

多載

名稱	Description
Write(String)	會寫入追蹤訊息到追蹤日誌。
Write(String, String)	會將追蹤資訊寫入追蹤日誌，包括訊息及任何使用者自訂的分類。
Write(String, String, Exception)	會將追蹤資訊寫入追蹤日誌，包括任何使用者自訂的分類、追蹤訊息及錯誤資訊。

Write(String)

會寫入追蹤訊息到追蹤日誌。

public:
 void Write(System::String ^ message);

public void Write(string message);

member this.Write : string -> unit

Public Sub Write (message As String)

參數

message: String

寫入日誌的追蹤訊息。

備註

每次呼叫該 Write 方法時， TraceContext 追蹤訊息會被 TraceRecords 加入訊息集合，處理事件時 TraceFinished 可存取。訊息加入時，屬性IsWarning設為，falseErrorInfo屬性設為 null。

另請參閱

ASP.NET 追蹤概述

適用於

Write(String, String)

會將追蹤資訊寫入追蹤日誌，包括訊息及任何使用者自訂的分類。

public:
 void Write(System::String ^ category, System::String ^ message);

public void Write(string category, string message);

member this.Write : string * string -> unit

Public Sub Write (category As String, message As String)

參數

category: String

接收訊息的追蹤類別。

message: String

寫入日誌的追蹤訊息。

範例

以下程式碼範例示範如何呼叫 Write 該方法，將錯誤追蹤訊息寫入追蹤日誌。在此範例中，代理會遍歷追蹤訊息並將它們寫成 HTML 表格;然而，你可以將相同的資訊寫入資料庫或分析工具使用者。

<%@ Page language="c#" Trace="true" %>
<script runat="server">
void Page_Load(object sender, EventArgs e)
{
    // Register a handler for the TraceFinished event.
    Trace.TraceFinished += new 
        TraceContextEventHandler(this.OnTraceFinished);

    // Write a trace message.
    Trace.Write("Web Forms Infrastructure Methods", "USERMESSAGE: Page_Load complete.");
}
 
// A TraceContextEventHandler for the TraceFinished event.
void OnTraceFinished(object sender, TraceContextEventArgs e)
{
    TraceContextRecord r = null;    
    
    // Iterate through the collection of trace records and write 
    // them to the response stream.
    Response.Write("<table>");
    foreach(object o in e.TraceRecords)
    {
        r = (TraceContextRecord)o;
        Response.Write(String.Format("<tr><td>{0}</td><td>{1}</td></tr>", r.Message, r.Category));        
    }
    Response.Write("</table>");
}       
</script>

<%@ Page language="VB" Trace="true" %>
<script runat="server">
' The Page_Load method.
Private Sub Page_Load(sender As Object, e As EventArgs)

    ' Register a handler for the TraceFinished event.
    AddHandler Trace.TraceFinished, AddressOf OnTraceFinished

    ' Write a trace message.
    Trace.Write("Web Forms Infrastructure Methods", "USERMESSAGE: Page_Load complete.")
End Sub ' Page_Load
 
' A TraceContextEventHandler for the TraceFinished event.
Private Sub OnTraceFinished(sender As Object, e As TraceContextEventArgs)

    Dim r As TraceContextRecord
    Dim o As Object
    
    ' Iterate through the collection of trace records and write 
    ' them to the response stream.
    Response.Write("<table>")
    For Each o In e.TraceRecords
        r = CType(o, TraceContextRecord)
        Response.Write(String.Format("<tr><td>{0}</td><td>{1}</td></tr>", r.Message, r.Category))
    Next
    Response.Write("</table>")

End Sub ' OnTraceFinished
</script>

備註

另請參閱

ASP.NET 追蹤概述

適用於

Write(String, String, Exception)

會將追蹤資訊寫入追蹤日誌，包括任何使用者自訂的分類、追蹤訊息及錯誤資訊。

public:
 void Write(System::String ^ category, System::String ^ message, Exception ^ errorInfo);

public void Write(string category, string message, Exception errorInfo);

member this.Write : string * string * Exception -> unit

Public Sub Write (category As String, message As String, errorInfo As Exception)

參數

category: String

接收訊息的追蹤類別。

message: String

寫入日誌的追蹤訊息。

errorInfo: Exception

一個 Exception 包含錯誤資訊的

範例

以下程式碼範例示範如何呼叫 Write 該方法，將錯誤追蹤訊息寫入追蹤日誌。在此範例中，不同的例外被追蹤為錯誤與警告。當頁面拋出時 ArgumentException，會用該 Warn 方法寫入警告訊息。當頁面拋出， InvalidOperationException會用該 Write 方法寫入錯誤訊息。

<%@ Page language="c#" Trace="true" %>
<script runat="server">
void Page_Load(object sender, EventArgs e)
{
    // Register a handler for the TraceFinished event.
    Trace.TraceFinished += new 
        TraceContextEventHandler(this.OnTraceFinished);

    try {
        throw new ArgumentException("Trace Test");
    }
    catch (InvalidOperationException ioe) {    
        // You can write an error trace message using the Write method.
        Trace.Write("Exception Handling", "Exception: Page_Load.", ioe);
    }
    catch (ArgumentException ae) {    
        // You can write a warning trace message using the Warn method.
        Trace.Warn("Exception Handling", "Warning: Page_Load.", ae);
    }
}
 
// A TraceContextEventHandler for the TraceFinished event.
void OnTraceFinished(object sender, TraceContextEventArgs e)
{
    TraceContextRecord r = null;    
    
    // Iterate through the collection of trace records and write 
    // them to the response stream.
    foreach(object o in e.TraceRecords)
    { 
        r = (TraceContextRecord)o;
        if (r.IsWarning) {
            Response.Write(String.Format("warning message: {0} <BR>", r.Message));
        }
        else {
            Response.Write(String.Format("error message: {0} <BR>", r.Message));
        }

    }
}       
</script>

<%@ Page language="VB" Trace="true" %>
<script runat="server">
' The Page_Load method.
Private Sub Page_Load(sender As Object, e As EventArgs)

    ' Register a handler for the TraceFinished event.
    AddHandler Trace.TraceFinished, AddressOf OnTraceFinished

    Try 
    Dim ae As New ArgumentException("Trace Test")
        Throw ae
    
    catch ioe As InvalidOperationException
        ' You can write an error trace message using the Write method.
        Trace.Write("Exception Handling", "Exception: Page_Load.", ioe)
    
    Catch ae As ArgumentException
        ' You can write a warning trace message using the Warn method.
        Trace.Warn("Exception Handling", "Warning: Page_Load.", ae)

    End Try

End Sub ' Page_Load
 
' A TraceContextEventHandler for the TraceFinished event.
Private Sub OnTraceFinished(sender As Object, e As TraceContextEventArgs)

    Dim r As TraceContextRecord
    Dim o As Object
    
    ' Iterate through the collection of trace records and write 
    ' them to the response stream.

    For Each o In e.TraceRecords
        r = CType(o, TraceContextRecord)
    If r.IsWarning Then
            Response.Write(String.Format("warning message: {0} <BR>", r.Message))
        Else
            Response.Write(String.Format("error message: {0} <BR>", r.Message))
        End If
    Next

End Sub	' OnTraceFinished
</script>

備註

每次呼叫該 Write 方法時， TraceContext 追蹤訊息會被 TraceRecords 加入訊息集合，處理事件時 TraceFinished 可存取。訊息加入時，其 IsWarning 屬性設為 false，屬性 ErrorInfo 則設為參數傳遞 errorInfo 的物件。

另請參閱

適用於

意見反應

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共用方式為

TraceContext.Write 方法

定義

多載

Write(String)

參數

備註

另請參閱

適用於

Write(String, String)

參數

範例

備註

另請參閱

適用於

Write(String, String, Exception)

參數

範例

備註

另請參閱

適用於

意見反應